Method of manufacturing connect



Sept. 8, 1936.

B. DJBNER METHOD OF MANUFACTURING CONNECTERS AND ARTICLES PRODUCED'THEREBY Original Filed Sept. 5, 1931 2 Sheets-Sheet l Zhmcntor 5ERN DIANE/e Ctttorncg Sept. 8, 1936. D|BNER Re. 20,096

OF MANUFACT CONNECTERS AND ARTICLES PRODUCED THEREBY inal Filed Sept. 5, 1931 2 Sheets-Sheet 2 55R DIENER (Ittorncg' g mum waste of material andthe Reissned a, use

UNITED 's'rA'r s METHOD OI IANUI'AGI'IJIING comer-A ms AND AI'IICIIS PIODUGID Tm I m -M n ter, WHO. 1,957,580,6ated1lay 8, 1'3, 88

September 5, 1931. Applleafion forrdmelay 1, SerialNo. missromantici m-14s)" This invention relates to methods of forming. eonneetersandarticlesproducedtherebyandb a continuation in part of applicant's co-pending 1 application, No. 479,890 September 11, 5 i930. V w

The connecter in the manufactin'e of which theprocesslat'ertobe describedisemployedeonsists of a U- shaped member having segmental ex teriorly threaded legs on which is mounted a nut, the nut having rotatably attached thereto a follower arranged in the slot between said legs. Electrical conductors or the like are arranged between the bridge of the U and the follower and upon rotation of the nut on the legs, the follower clamps the conductors between it and the bridge ofthe U.

An-object Mathis-invention isa process of the manufacture of the U-shaped members which, produces the same inexpensively and with mininovel articles @poduced thereby.v a

.According to the present invention, the U-' shaped member is fabricated by first cutting mill length rods into sections of approximately half theextended length of'thefinished U member.-

, The short section of rod isthen forged and trimmed to produce a blank segmental-in cross section and of the length of the extended U. this blank D wider at its central portion than at so the end portions. *The blankis then bent centrallyinto u' shapeandthreadsareappliedto the curved surfaces of the legs. Preferably these threadsare'produced bya diestampingoperation, although they may be cut by using a rotating-die. Bharpandraggededgesmaybeeiimi nated and {more finished and eflicient device produced byzbeveling the the segmental blank. ln makingthey-shaped member according to thisproeess,there is but verylittie wast of material and the U-sbaped mbers are.pro-' ducedeoonomieally andwithaminimumoflabor m objects, novel features I of this invention will be apparent from the folwherein.

rigaitoiinclusiveareplanvlewsoftbeblank indifferentstagesy r 1l"igs.5and6aseseetionsnflinesl-iannll-C sorespectivelyofFie.4: w

Figs-'1andBarecllagrammatic illustrations ofthebendingstellt Fig.9isasectionuthelinellofflg. 8: -Flg.10is'adiagrammaticillustrationofthe illforjmationcfthreadobyadiestanipingoperation:

and advantages I lowing specification and 11 a a perspective view. of thread forming dies;

one ofthe Fig. 12 is a diagrammatic illustration of cut tingthethreadsbyarotatingdie; and

Fig. 13 is a perspective product.

Starting with a mill length rod ll (Fig. 1) the same is cut into sections il (Fig. 2) of approximately half the extended length of the finished product. The section II is then forged l0 toprodueeablank lfhavingathinflashing ll (P18. 3) after whlh the flashing is trimmed. leaving the blank If (Pig. 4). In the case of V large blanks. the section II is hot forged, but in connection with small blanks, the sectio may 15 1 be cold forged. This blank is of the same length as the extended length of the finished product 1 and is generally segmental in cross section. The central portion M which "is to form the bridge of the U inthefinishedproduct'is of'greate'rwidthmthan the remainder of the blank. The segmental mention of the blank I! is shown in Figs. 5 and 6 and preferably the longitudinal edges of the blank arebevelled as shown in these two I 26 The blank i2 is then bent into substantially 'U-shape form as shown in Fig. 'I. In this operation, a plunge! ll presses the wide portion ll into legsoftheuinexactparaile lreiatiombut these .are arranged in such relationina subsequent step disclosed in Fig. 8, wherein-the blank l2, whileonthepiungervllisoperated upon bytwoifl forming dies 11 which complete the flattening of the faces above referredto a s weli as bring the legs d-the. u into parallel relation; The flat ofthe'bridgeofthetlareclearlyshownin faces 9. Theendoftheplunger lliskmirledwith 1 resultthatduring the operation of forming {the innerfaoeofthebridge oftheUis roughened. thus increasingtheholding-power of thennishedclamp.

The formed uisthensupportedo'navmandrel ll withthelegsoftheustraddlingthemandrei. A pair of .formingdies." (see Fig. 11) are brought intojoperative relation to the mandrel and U-shaped memberandthreods arestamped ontheeurvedsurfaeesofthelegs. 'Ihediesllaremadewith'curvedreeessesconformingtothe eurvedsiu-facesofthelegsand'areprovidedwith' threadsbymeansofwhichthethreadsonthelegs are formed. after the diestamping of the view of the fl nished s' complete and ready for use.

. edges inasmuch as the threading tool when leavingormeetingthelegsdoesnotpass'oversharp- As a further alternative method of forming the threads on the outer face of the legs of the U member. such threads may be rolled on the legs by use of suitable machinery adapted for the purpose.- Formation of the threads either by die stampingor by rolling involves working the metal to producesuch threads without any loss of material and such working very materially increases the surfacestrengthofthe material.

The finished member isprovidedwithflat surfaces a and by means of these'faces-the U- shaped member may be held by a wrench while being assembled with the nut and follower.

1 claim:

split bolts which -1. J'hemethod of forming comprises forging a bar ofhigh copper content into a blank with end portions having plane and arcuate surfaces, bending the central portions-of said blank to form a U with the plane surfaces of said end portions in opposed parallel relation: ship, and pressing threads into the outer arcuate. surfaces of said end portions. r

,2. The method of forming split bolts; which comprises forging a barofihigh copper conlznt into a blank with end portions having plane and arcuate surfaces, bending the central portionof said blank to form a U with. the plane surfaces of said end portions in opposed parallel relationship, forming flat surfaces adjacent the bridge of the U, and pressing threads into ,the outer arcuate surfaces of said end portions. e

3'. The method of forming split bolts which 7 comprises forging a btir of high copper content said end in opposed parallel relationship;

md J v nnll I surfacesofsaidendporfl 4. The method of forming split. bolts which comprises forging a bar of high copper content into o. blank with end portions having :1

arcu ate surfaces, bendingthe central portion of said blank to term a u with theplane -outer arcuatesurfaces of said end portions.

5. A split bolt for electrical connecters for.

' clamping electrical conductors consistin gj'of ;a

U -shap ed having segmental exteriorly threaded less. the metal having an'elongated grain structure; said U-shaped member having been forged and bent from a 'barrof metal, a U-with end portionshaving planeand arcuate surfaces with the plane of said end portions in opposed parallel rebtionship and the threadsofthelegs the outer surfaces of said end portions.

6. A split bolt for electrical connecters for metal memberhavingtal ex;- threaded legs, said U-shaped memberping electrical conductors of-a high copper content to form; by flow-of the,

ha been forged and bent from a bar of metal to form a U wit'liend portions having "planeand arcuate surfaces with the plancsurfaces-of said end portions inopposed parallelrelation ship and the'threads of the legs having been pressed from the 'outer surfaces 7. A split belt .for electrical connecters for, clamping electrical conductors of a of said U-shaped metal member having 'segme'ntalfexteriorly threaded legs, the-metal having an elongated grain structure; said U-shaped member havingbeenforgedandbentfromabarofhish copper content to form a U with end portions having plane and arcuate plane surfaces of sald'end portions in'opposed parallel relationship and'thethreads of the legs having been pressed from the outer surfaces of saidendportionswith the BERN manna! 

